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- /*
- Unix SMB/Netbios implementation.
- Version 1.9.
- NBT netbios routines and daemon - version 2
- Copyright (C) Andrew Tridgell 1994-1998
- Copyright (C) Luke Kenneth Casson Leighton 1994-1998
- Copyright (C) Jeremy Allison 1994-1998
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- */
-
- #include "includes.h"
-
- extern int DEBUGLEVEL;
-
- extern pstring scope;
-
- /****************************************************************************
- Deal with a response packet when releasing one of our names.
- ****************************************************************************/
-
- static void release_name_response(struct subnet_record *subrec,
- struct response_record *rrec, struct packet_struct *p)
- {
- /*
- * If we are releasing broadcast, then getting a response is an
- * error. If we are releasing unicast, then we expect to get a response.
- */
-
- struct nmb_packet *nmb = &p->packet.nmb;
- BOOL bcast = nmb->header.nm_flags.bcast;
- BOOL success = True;
- struct nmb_name *question_name = &rrec->packet->packet.nmb.question.question_name;
- struct nmb_name *answer_name = &nmb->answers->rr_name;
- struct in_addr released_ip;
-
- /* Sanity check. Ensure that the answer name in the incoming packet is the
- same as the requested name in the outgoing packet. */
-
- if(!nmb_name_equal(question_name, answer_name))
- {
- DEBUG(0,("release_name_response: Answer name %s differs from question \
- name %s.\n", namestr(answer_name), namestr(question_name)));
- return;
- }
-
- if(bcast)
- {
- /* Someone sent a response. This shouldn't happen/ */
- DEBUG(1,("release_name_response: A response for releasing name %s was received on a \
- broadcast subnet %s. This should not happen !\n", namestr(answer_name), subrec->subnet_name));
- return;
- }
- else
- {
- /* Unicast - check to see if the response allows us to release the name. */
- if(nmb->header.rcode != 0)
- {
- /* Error code - we were told not to release the name ! What now ! */
- success = False;
-
- DEBUG(0,("release_name_response: WINS server at IP %s rejected our \
- name release of name %s with error code %d.\n", inet_ntoa(p->ip),
- namestr(answer_name), nmb->header.rcode));
-
- }
- else if(nmb->header.opcode == NMB_WACK_OPCODE)
- {
- /* WINS server is telling us to wait. Pretend we didn't get
- the response but don't send out any more release requests. */
-
- DEBUG(5,("release_name_response: WACK from WINS server %s in releasing \
- name %s on subnet %s.\n", inet_ntoa(p->ip), namestr(answer_name), subrec->subnet_name));
-
- rrec->repeat_count = 0;
- /* How long we should wait for. */
- rrec->repeat_time = p->timestamp + nmb->answers->ttl;
- rrec->num_msgs--;
- return;
- }
- }
-
- DEBUG(5,("release_name_response: %s in releasing name %s on subnet %s.\n",
- success ? "success" : "failure", namestr(answer_name), subrec->subnet_name));
-
- if(success)
- {
- putip((char*)&released_ip ,&nmb->answers->rdata[2]);
-
- if(rrec->success_fn)
- (*rrec->success_fn)(subrec, rrec->userdata, answer_name, released_ip);
- standard_success_release( subrec, rrec->userdata, answer_name, released_ip);
- }
- else
- {
- /* We have no standard_fail_release - maybe we should add one ? */
- if(rrec->fail_fn)
- (*rrec->fail_fn)(subrec, rrec, answer_name);
- }
-
- remove_response_record(subrec, rrec);
- }
-
- /****************************************************************************
- Deal with a timeout when releasing one of our names.
- ****************************************************************************/
-
- static void release_name_timeout_response(struct subnet_record *subrec,
- struct response_record *rrec)
- {
- /*
- * If we are releasing unicast, then NOT getting a response is an
- * error - we could not release the name. If we are releasing broadcast,
- * then we don't expect to get a response.
- */
-
- struct nmb_packet *sent_nmb = &rrec->packet->packet.nmb;
- BOOL bcast = sent_nmb->header.nm_flags.bcast;
- BOOL success = False;
- struct nmb_name *question_name = &sent_nmb->question.question_name;
- struct in_addr released_ip;
-
- if(bcast)
- {
- if(rrec->num_msgs == 0)
- {
- /* Not receiving a message is success for broadcast release. */
- success = True;
-
- /* Get the ip address we were trying to release. */
- putip((char*)&released_ip ,&sent_nmb->additional->rdata[2]);
- }
- }
- else
- {
- /* Unicast - if no responses then it's an error. */
- if(rrec->num_msgs == 0)
- {
- DEBUG(2,("release_name_timeout_response: WINS server at address %s is not \
- responding.\n", inet_ntoa(rrec->packet->ip)));
-
- /* Keep trying to contact the WINS server periodically. This allows
- us to work correctly if the WINS server is down temporarily when
- we want to delete the name. */
-
- /* Reset the number of attempts to zero and double the interval between
- retries. Max out at 5 minutes. */
- rrec->repeat_count = 3;
- rrec->repeat_interval *= 2;
- if(rrec->repeat_interval > (5 * 60))
- rrec->repeat_interval = (5 * 60);
- rrec->repeat_time = time(NULL) + rrec->repeat_interval;
-
- DEBUG(5,("release_name_timeout_response: increasing WINS timeout to %d seconds.\n",
- rrec->repeat_interval));
- return; /* Don't remove the response record. */
- }
- }
-
- DEBUG(5,("release_name_timeout_response: %s in releasing name %s on subnet %s.\n",
- success ? "success" : "failure", namestr(question_name), subrec->subnet_name));
-
- if(success && rrec->success_fn)
- {
- if(rrec->success_fn)
- (*rrec->success_fn)(subrec, rrec->userdata, question_name, released_ip);
- standard_success_release( subrec, rrec->userdata, question_name, released_ip);
- }
- else
- {
- /* We have no standard_fail_release - maybe we should add one ? */
- if( rrec->fail_fn)
- (*rrec->fail_fn)(subrec, rrec, question_name);
- }
-
- remove_response_record(subrec, rrec);
- }
-
- /****************************************************************************
- Try and release one of our names.
- ****************************************************************************/
-
- BOOL release_name(struct subnet_record *subrec, struct name_record *namerec,
- release_name_success_function success_fn,
- release_name_fail_function fail_fn,
- struct userdata_struct *userdata)
- {
- int i;
-
- /* Ensure it's a SELF name, and in the ACTIVE state. */
- if((namerec->source != SELF_NAME) || !NAME_IS_ACTIVE(namerec))
- {
- DEBUG(0,("release_name: Cannot release name %s from subnet %s. Source was %d \n",
- namestr(&namerec->name), subrec->subnet_name, namerec->source));
- return True;
- }
-
- /* Set the name into the deregistering state. */
- namerec->nb_flags |= NB_DEREG;
-
- /*
- * Go through and release the name for all known ip addresses.
- * Only call the success/fail function on the last one (it should
- * only be done once).
- */
-
- for( i = 0; i < namerec->num_ips; i++)
- {
- if(queue_release_name( subrec,
- release_name_response,
- release_name_timeout_response,
- (i == (namerec->num_ips - 1)) ? success_fn : NULL,
- (i == (namerec->num_ips - 1)) ? fail_fn : NULL,
- (i == (namerec->num_ips - 1)) ? userdata : NULL,
- &namerec->name,
- namerec->nb_flags,
- namerec->ip[i]) == NULL)
- {
- DEBUG(0,("release_name: Failed to send packet trying to release name %s IP %s\n",
- namestr(&namerec->name), inet_ntoa(namerec->ip[i]) ));
- return True;
- }
- }
- return False;
- }
-